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KMID : 0361020090520010029
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Korean Journal of Otolaryngology - Head and Neck Surgery
2009 Volume.52 No. 1 p.29 ~ p.35
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Effect of Bimodal Hearing in Speech Perception Under Noisy Environment According to Residual Hearing
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Lim Eun-Jung
Lee Sang-Heun
Lee Kyu-Yup
Kim Yee-Hyuk
Sin Chang-Min
Youn Sung-Jae
Park Ji-Hyun
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Abstract
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Background and Objectives: In this study, we evaluated the effect of bimodal hearing in the speech perception test and the increasing level of bimodal hearing over cochlear implantation in speech perception score regarding residual hearing.
Subjects and Method : Nineteen prelingually deaf patients, who had used bimodal hearing over a period of 8 months, were divided in two groups in accordance to their low frequency residual hearing. The children were tested in open-set speech perception under +10 SNR and +20 SNR. The scores of bimodal hearing and unilateral cochlear implantation were compared by the Wilcoxon signed-rank test. Also, the increased level of speech perception scores of bimodal hearing over cochlear implantation alone were calculated using the formula, [bimodal score (%) - unilateral cochlear implantation (%)], and was compared between groups.
Results: In pure tone audiometry under silent condition, the result of bimodal hearing was similar to unilateral cochlear implantation in magnitude in both groups. Under the noisy condition, both groups had better result in bimodal hearing in terms of speech perception. Also, the increased level was higher in bimodal hearing over unilateral cochlear implantation in the better residual hearing group. However, since the sample size was small enough, it is considered that there was no statistical significance.
Conclusion: Cochlear implanted patients with residual hearing are expected to get better speech perception in noisy environment with bimodal hearing regardless of the level of residual hearing.
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KEYWORD
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Cochlear implants, Hearing aids, Speech perception, Bimodal hearing
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